What type of message indicates a situation that is urgent but not life-threatening?

The type of message that signifies a situation that is urgent but not life-threatening is the Pan-pan message. This message is used in maritime communication to alert other vessels or stations about a problem that requires attention but does not pose an immediate danger to life or property.

It serves as a call for assistance when there is a situation that could develop into a more serious emergency if not addressed promptly. Examples might include situations such as a vessel experiencing engine failure or a boat running low on fuel, where safety is compromised but the threat to life is not imminent.

In contrast, the Securite message is used for navigational warnings or situations that require caution, while Mayday indicates a life-threatening emergency that necessitates immediate assistance. A Distress Alert also signals a life-threatening situation. Thus, Pan-pan is specifically tailored to communicate urgent matters that are serious yet not emergencies requiring immediate life-saving responses.